Grade 7L Heavy Hex Nut

ASTM A194 Grade 7L heavy hex nuts are manufactured from alloy steel, quenched and tempered. The ASTM A194 specification covers carbon steel, alloy steel, and stainless steel nuts for bolts in high pressure or high temperature service. They are a common high strength nut used with stud bolts for high and low temperature service, such as B16 and L7. When low temperature requirements are specified for Grade 7 nuts, the Charpy test procedures and requirements as defined in Specification A320/A320M for Grade L7 will apply. Grade markings consists of the grade symbol "7L". Dimensional specifications are governed by ASME B18.2.2. Heavy hex nuts provide increased bearing surface area over finished nuts such as J995 Grade 5 nuts.

Products
Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGrade 7

Per ASME B18.2.2-2015
Nominal Diameter		UNC	UN8	F			G		H
				Width Across Flats			Width Across Corners		Thickness
				Basic	Max	Min	Max	Min	Basic	Max	Min
1/4	0.250	20		1/2	0.500	0.488	0.577	0.556	15/64	0.250	0.218
5/16	0.313	18		9/16	0.562	0.546	0.650	0.220	19/64	0.314	0.280
3/8	0.375	16		11/16	0.688	0.669	0.794	0.763	23/64	0.377	0.341
7/16	0.438	14		3/4	0.750	0.728	0.866	0.830	27/64	0.441	0.403
1/2	0.500	13		7/8	0.875	0.850	1.010	0.990	31/64	0.504	0.464
9/16	0.563	12		15/16	0.938	0.909	1.083	1.037	35/64	0.568	0.526
5/8	0.625	11		1 1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587
3/4	0.750	10		1 1/4	0.250	1.212	1.443	1.382	47/64	0.758	0.710
7/8	0.875	9		1 7/16	1.438	1.394	1.660	1.589	55/64	0.885	0.833
1	1.000	8		1 5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956
1 1/8	1.125	7	8	1 13/16	1.812	1.756	2.093	2.002	1 7/64	1.139	1.079
1 1/4	1.250	7	8	2	2.000	1.380	2.309	2.209	1 7/32	1.251	1.187
1 3/8	1.375	6	8	2 3/16	2.188	2.119	2.526	2.416	1 11/32	1.378	1.310
1 1/2	1.500	6	8	2 3/8	2.375	2.300	2.742	2.622	1 15/32	1.505	1.433
1 5/8	1.625	5 1/2	8	2 9/16	2.562	2.481	2.959	2.828	1 19/32	1.632	1.556
1 3/4	1.750	5	8	2 3/4	2.750	2.662	3.175	3.035	1 23/32	1.759	1.679
1 7/8	1.875	5	8	2 15/16	2.938	2.844	3.392	3.242	1 27/32	1.886	1.802
2	2.000	4 1/2	8	3 1/8	3.125	3.025	3.608	3.449	1 31/32	2.013	1.925
2 1/4	2.250	4 1/2	8	3 1/2	3.500	3.388	4.041	3.862	2 13/64	2.251	2.155
2 1/2	2.500	4	8	3 7/8	3.875	3.750	4.474	4.275	2 29/64	2.505	2.401
2 3/4	2.750	4	8	4 1/4	4.250	4.112	4.907	4.688	2 45/64	2.759	2.647
3	3.000	4	8	4 5/8	4.625	4.475	5.340	5.102	2 61/64	3.013	2.893
3 1/4	3.250	4	8	5	5.000	4.838	5.774	5.515	3 3/16	3.252	3.124
3 1/2	3.500	4	8	5 3/8	5.375	5.200	6.207	5.928	3 7/16	3.506	3.370
3 3/4	3.750	4	8	5 3/4	5.750	5.562	5.562	6.341	3 11/16	3.670	3.616
4	4.000	4	8	6 1/8	6.125	5.925	5.925	6.755	3 15/16	4.014	3.862

All dimensions are in inches.

Grade 7L Heavy Hex Nut

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Diameter	Thread Pitch	Width Across Flats	Height of Nut	Item #	Availability	Price	Quantity
Grade 7L Heavy Hex Nut Diameter 1/2 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 13 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 7/8 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 0.4844 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG70500000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $0.48006/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1/2-13 S3 A194 GRADE 7L HEAVY HEX NUT $0.48006/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 5/8 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 11 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 1 1/16 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 0.6094 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG70620000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $0.60595/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
5/8-11 S3 A194 GRADE 7L HEAVY HEX NUT $0.60595/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 3/4 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 10 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 1 1/4 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 0.7344 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG70750000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $0.93903/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
3/4-10 S3 A194 GRADE 7L HEAVY HEX NUT $0.93903/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 7/8 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 9 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 1 7/16 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 0.8594 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG70870000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $1.47861/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
7/8-9 S3 A194 GRADE 7L HEAVY HEX NUT $1.47861/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 1 5/8 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 0.9844 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71000000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $2.31512/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1-8 S3 A194 GRADE 7L HEAVY HEX NUT $2.31512/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 1/8 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 1 13/16 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.1094 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71120000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $2.55217/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 1/8-8 S3 A194 GRADE 7L HEAVY HEX NUT $2.55217/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 1/4 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 2 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.2188 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71250000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $4.16432/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT $4.16432/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 3/8 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 2 3/16 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.3438 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71370000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $5.12197/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 3/8-8 S3 A194 GRADE 7L HEAVY HEX NUT $5.12197/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 1/2 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 2 3/8 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.4688 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71500000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $5.64885/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT $5.64885/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 5/8 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 2 9/16 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.5938 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71620000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $7.30751/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 5/8-8 S3 A194 GRADE 7L HEAVY HEX NUT $7.30751/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 3/4 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 2 3/4 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.7187 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71750000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $16.93534/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 3/4-8 S3 A194 GRADE 7L HEAVY HEX NUT $16.93534/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 1 7/8 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 2 15/16 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.8437 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG71870000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $14.18004/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
1 7/8-8 S3 A194 GRADE 7L HEAVY HEX NUT $14.18004/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 2 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 3 1/8 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 1.9687 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG72000000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $24.14707/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
2-8 S3 A194 GRADE 7L HEAVY HEX NUT $24.14707/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 2 1/4 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 3 1/2 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 2.2031 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG72250000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $24.45014/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
2 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT $24.45014/EA Qty In Stock Product Detail
Grade 7L Heavy Hex Nut Diameter 2 1/2 Quantity Discounts	Grade 7L Heavy Hex Nut Thread Pitch 8 Quantity Discounts	Grade 7L Heavy Hex Nut Width Across Flats 3 7/8 Quantity Discounts	Grade 7L Heavy Hex Nut Height of Nut 2.4531 Quantity Discounts	Grade 7L Heavy Hex Nut Item # NHG72500000-I Quantity Discounts	Grade 7L Heavy Hex Nut Availability In Stock Quantity Discounts	Grade 7L Heavy Hex Nut Price $27.86538/EA Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts	See Quantity Discounts	Grade 7L Heavy Hex Nut Unit of Measure EA Quantity Discounts
2 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT $27.86538/EA Qty In Stock Product Detail

ASTM A194	This specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1⁄4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1⁄4 in. and M6 nominal and above. These nuts are intended for high-pressure or high temperature service, or both. Grade substitutions without the purchaser’s permission are not allowed.
ASME B18.2.2	Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Alloy Steel	Per ASTM A194/A194M-16
Diameter	Proof Load Stress	Core Hardness
Diameter	Min psi	Rockwell
1/4" thru 4"	175,000	C24 to C35

Per ASTM A194/A194M-16
Grade	Carbon	Manganese	Phosphorus	Sulfur (1)	Silicon	Chromium	Molybdenum
Grade	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
7	0.38-0.48	0.75-1.00	0.035 max	0.040 max	0.15-0.35	0.80-1.10	0.15-0.25

Grade 7L Heavy Hex Nut

Technical Data

Governing Standards

Governing StandardsGrade 7

Mechanical Properties

Mechanical PropertiesGrade 7

Chemical Properties

Chemical PropertiesGrade 7

Dimensional Specifications

Dimensional SpecificationsGrade 7

Diameter

Thread Pitch

Thread Type

Width Across Flats

1/2-13 S3 A194 GRADE 7L HEAVY HEX NUT

5/8-11 S3 A194 GRADE 7L HEAVY HEX NUT

3/4-10 S3 A194 GRADE 7L HEAVY HEX NUT

7/8-9 S3 A194 GRADE 7L HEAVY HEX NUT

1-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 1/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 3/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 5/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 3/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 7/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

2-8 S3 A194 GRADE 7L HEAVY HEX NUT

2 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

2 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT